Metal powder injection molding electronic parts molding steps
time：2020-04-23Views：590 Author：Best Seiko
Metal powder injection molding is the traditional injection molding, which makes use of injection molding technology to change the manufacturing of solid metal parts. In this process, the raw material, referred to simply as raw material, is a powder mixture of metal and polymer. For this reason, MIM is sometimes called powder injection molding (PIM). Using a standard injection molding machine, the powder is melted and injected into the mold, where it cools and solidifies into the shape of the desired part. The subsequent heating process removes unwanted polymers and produces a high-density metal part. Best Metal's metal powder injection molding electronic parts Metal powder injection molding is suitable for mass production of small metal parts. Unlike injection molding, these parts can be complex in geometry and have thin walls and details. The metal powder used makes it possible to use various ferrous and non-ferrous metal alloys and material properties (strength, hardness, abrasion resistance, corrosion resistance, etc.) close to those of wrought metals. Moreover, because the metal is not melted in the MIM process (unlike the metal casting process), the superalloy can be used without any negative tool life impact. Commonly used MIM parts of metals include the following: low alloy steel; stainless steel; high speed steel; iron rod; cobalt alloy; copper alloy; nickel alloy; tungsten alloy; titanium alloy. Metal injection molding electronic accessories are found in many industries, including aerospace, automotive, consumer products, medical/dental and telecommunications. MIM components can be found in mobile phones, sporting goods, power tools, surgical instruments, and various electronic and optical devices. Metal powder injection molding Electronic parts molding process includes the following steps: raw material preparation-The first step is to create a powder mixture of metal and polymer. The powder metals used here are finer (usually at 20 microns) than those used in traditional powder metallurgy methods. The powdered metal is mixed with a hot thermoplastic binder, cooled, and then pelletized into a uniform raw material in the form of pellets. The resulting raw materials are typically 60% metal and 40% polymer (volume). Injection molding-powder raw materials are molded in plastic injection molding using the same equipment and tools. However, the cavity is designed to account for about 20% of the shrinkage during sintering. In the injection molding cycle, the raw material is melted and injected into the mold cavity, where it cools and solidifies into the shape of the part. A portion of the molded "green" is ejected and then cleaned to remove all flash memory. Degreasing-This step removes the binder from the metal polymer. In some cases, the “green” part of the solvent degreasing is first placed in water or a chemical bath to dissolve most of the binder. After (in place of) this step, thermal degreasing or pre-sintering is performed. A part of the "green" is heated in a low-temperature furnace, so that the polymer binder is removed by evaporation. As a result, the remaining "brown" metal portion will contain about 40% empty space through the volume. Sintering – The next step is sintering to reduce the empty space to about 1-5%, resulting in a high-density “brown” part (95-99%) metal part in a high-temperature furnace (up to 2500°F). The furnace uses an inert gas atmosphere and reaches a temperature close to 85% of the melting point of the metal. This process will remove the pores of the material, resulting in a partial reduction to 75-85% of its formed size. However, this shrinkage occurs uniformly and can be accurately predicted. The resulting part retains the high tolerance of the original molded shape, but is now much denser. After the sintering process, no secondary operations are required to improve resistance or surface finish. However, like a part of a cast metal, some secondary processes can be performed to increase functionality, improve material performance, or assemble other components. For example, the MIM part can be machined, heat treated, or welded. Metal powder injection molding (MIM) design rules: When the design part is made with MIM, most of the design rules for plastic injection molding still apply. However, there are some exceptions or additions, such as the following: Wall Thickness-Just as with plastic injection molding, the wall thickness should be minimized and the entire part should be kept uniform. It is worth noting that in the MIM process, reducing the wall thickness not only reduces the amount of material and cycle time, but also reduces the degreasing and sintering time as well. Draft-Unlike injection molding, many MIM parts do not require any drafts. It is easier to use the polymer binder from the mold than most injection-molded polymers in the powder material version. In addition, the MIM parts are sufficiently cooled and shrunk around the molded features before spraying, because the mixture of metal powders takes longer to cool. Sintering support-During the sintering process, MIM parts must be properly supported, or they may be distorted as they shrink. By designing flat surfaces of parts on the same plane, standard flat support trays can be used. Otherwise, more expensive customized carriers may be needed. What value-added services can MIM do for you? Machining Fully automatic CNC machining center and CNC electronic discharge machining (EDM). Heat treatment To meet the specific hardness requirements of your parts. Ultrasonic cleaning Thoroughly remove particles embedded tightly attached to the solid surface. Passivation ensures the metallurgical stability of the parts by making the surface more passive and resistant to corrosion. Surface treatment Many types of surface treatment services are for your choice. Shenzhen Best Precision Technology Co., Ltd. is a diversified technology company integrating metal injection molding, metal and ceramic 3D printing, and metal jewelry development and production. Best Precision has reached a strategic cooperation with well-known domestic and foreign feeding companies (Kadem Feeding) and BSF for MIM product development and production, mainly for metal powder injection molding, metal powder injection molding, powder injection molding, powder injection molding, Metal 3D printing wire, metal powder injection molding factory, metal powder injection molding factory, powder injection molding factory, powder injection molding factory, MIM process, MIM processing, MIM factory to provide customers in various industries around the world with large quantities, high quality and reasonable MIM products at a price. The company has assembled a team of senior experts in technology, management and market development in the industry, adhering to many years of MIM technology experience and industrial production operation experience, with internationally mature MIM technology, efficient supply chain management and rapid and effective large Large-scale manufacturing capabilities provide customers with a one-stop solution from the preliminary design, sample development and mass production of MIM products. Metal Injection Molding Department: For a long time, we have been focusing on the R&D and production of MIM products. The company has advanced production equipment and testing equipment, which can produce various complex, high-precision, high-performance parts. With strong strength, the company has gradually developed into one of the companies in the Pearl River Delta MIM industry industry chain is very perfect. 3D Printing Department: Responsible for the development and production of metal 3D printing wires (metals, ceramics), providing 3D printing services and sales of 3D printers. At present, the company has many patents for metal 3D printing wire and ceramic 3D printing wire, and is equipped with multiple sets of production equipment. The company has the strength to provide customers with first-class quality services. Jewelry Department: The company has the strength of independent research and development, design and production of medium and high-end rare metal jewelry, and cooperates closely with the MIM department to develop an integrated production model. The company plans to strategically combine jewelry design with the advantages of MIM to diversify the design of jewelry and the concept of diversified materials. At present, the company has developed a number of novel designs and trendy jewelry. Shenzhen Best Precision Technology Co., Ltd. welcomes friends from all walks of life to visit and guide and negotiate business.